How can I simplify this Taylor expansion?

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ninevolt
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I want to show this taylor expansion:

[tex]\frac{1}{\sqrt{1+{x}^{2}}} \rightarrow x^2[/tex]


what I keep getting is something to the x^3 could some one please help me with this simple expansion?
 
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(1+x^2)^-0.5
= 1-0.25(X^2) there is no x^3 okay